Plugin marketplace fails to load: Invalid schema errors on multiple plugins

Description

The plugin marketplace (claude-plugins-official) fails to load due to schema validation errors on multiple plugin entries, making it impossible to install any plugins.

Steps to Reproduce

1. Run /plugin install telegram@claude-plugins-official
2. Or run /plugin marketplace add anthropics/claude-plugins-official

Error Output

Failed to load all marketplaces. Errors: claude-plugins-official: Invalid schema: plugins.2.source: Invalid input, plugins.5.source: Invalid input, plugins.12.source: Invalid input, plugins.29.source: Invalid input, plugins.48.source: Invalid input, plugins.57.source: Invalid input, plugins.62.source: Invalid input, plugins.64.source: Invalid input, plugins.86.source: Invalid input, plugins.96.source: Invalid input, plugins.104.source: Invalid input, plugins.116.source: Invalid input

Expected Behavior

The marketplace should load successfully and allow plugin installation.

Environment

• Claude Code (latest, updated today)
• macOS (Darwin 25.3.0)
• Date: 2026-03-24

Notes

The error affects 12 plugin entries in the registry. Since the marketplace fails entirely, no plugins can be installed — not just the affected ones.